Humanity's greatest heroes battle the gods for the survival of the human race! Once every millennium, the gods assemble to decide if humanity is worthy of its continued existence or if it should be destroyed! When the verdict is destruction, the final battle between the gods and mortal heroes will decide the survival or extinction of the human race--a battle known as Ragnarok! Until now, the human warriors of Ragnarok have been heroes who fought with great skill, cunning, and magic. But with Nikola Tesla in the arena, humanity has a hero who fights with the power of science! In life, Tesla unlocked many secrets of the universe, including the the ability to control gravity. But can even this miraculous power stand up to Beelzebub wielding a technique that is forbidden even in the depths of Helheim?.